'70 K-10 Parking Brake Light Stays On - The 1947 - Present Chevrolet & GMC Truck Message Board Network

COBob'70 K-10 · 04-09-2015, 06:04 PM

My parking brake light is constantly on. Fluid is full. Any ideas?

cdowns · 04-09-2015, 07:15 PM

these trucks do not have a parking brake light// the brake light signals that you have a brake problem

COBob'70 K-10 · 04-10-2015, 10:37 AM

Fluids good. Brakes are new within about 5000 miles.
What type of problem causes the light to come on?

geezer#99 · 04-10-2015, 10:44 AM

Your proportioning valve needs to be reset. Push the button in on the front. It's under the black cap.

COBob'70 K-10 · 04-10-2015, 11:18 AM

There is no button or black cap on my proportioning valve. It's solid with the only connections being fluid lines to the master cylinder and the brakes.
However, while looking for the button you describe, I noticed that the sensor wire was pinched between the master cylinder and the firewall. I loosened it up, got the wire out, and, Voila! Brake light is out!
Thanks to all for your help!

geezer#99 · 04-10-2015, 11:51 AM

Some don't have a reset button!
But now the thought is---Do you have a prop valve or a distribution block?
Are you still drums all around or disc/drum?

COBob'70 K-10 · 04-10-2015, 12:03 PM

All drums.

04-09-2015, 06:04 PM	#1
COBob'70 K-10 Registered User Join Date: Mar 2015 Location: Thornton, CO Posts: 38	'70 K-10 Parking Brake Light Stays On My parking brake light is constantly on. Fluid is full. Any ideas?

04-09-2015, 07:15 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: '70 K-10 Parking Brake Light Stays On these trucks do not have a parking brake light// the brake light signals that you have a brake problem __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-10-2015, 10:37 AM	#3
COBob'70 K-10 Registered User Join Date: Mar 2015 Location: Thornton, CO Posts: 38	Re: '70 K-10 Parking Brake Light Stays On Fluids good. Brakes are new within about 5000 miles. What type of problem causes the light to come on?

04-10-2015, 10:44 AM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,590	Re: '70 K-10 Parking Brake Light Stays On Your proportioning valve needs to be reset. Push the button in on the front. It's under the black cap.

04-10-2015, 11:18 AM	#5
COBob'70 K-10 Registered User Join Date: Mar 2015 Location: Thornton, CO Posts: 38	Re: '70 K-10 Parking Brake Light Stays On There is no button or black cap on my proportioning valve. It's solid with the only connections being fluid lines to the master cylinder and the brakes. However, while looking for the button you describe, I noticed that the sensor wire was pinched between the master cylinder and the firewall. I loosened it up, got the wire out, and, Voila! Brake light is out! Thanks to all for your help!

04-10-2015, 11:51 AM	#6
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,590	Re: '70 K-10 Parking Brake Light Stays On Some don't have a reset button! But now the thought is---Do you have a prop valve or a distribution block? Are you still drums all around or disc/drum?

04-10-2015, 12:03 PM	#7
COBob'70 K-10 Registered User Join Date: Mar 2015 Location: Thornton, CO Posts: 38	Re: '70 K-10 Parking Brake Light Stays On All drums.

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